JP6264660B2 - Sound source control device, karaoke device, sound source control program - Google Patents

Description

  The present invention relates to a sound source control device using MIDI (Musical Instrument Digital Interface), a karaoke device using the sound source control device, and a sound source control program used for the sound source control device.

  Conventionally, in a sound source control device such as a karaoke device, for example, when a function of a sound source unit provided by an external sound source server (hereinafter referred to as “external sound source unit”) can be used, an internal sound source control unit (Hereinafter referred to as “internal sound source unit”) allocates a necessary number of sound generation channels among the sound generation channels of the internal sound source unit and the sound source channels of the external sound source unit for sound generation according to the MIDI data, When the sound channel of the sound source is assigned, identification information of the sound channel assigned to the MIDI data is attached to the external sound source server and transmitted to the sound source channel indicated by the identification information of the external sound source portion. By generating waveform data in accordance with the MIDI data, the same waveform data is generated in the external sound source unit as in the internal sound source unit. It is known one using a synthesizer to allow the.

JP 2009-25498 A

  By the way, sound sources mounted on recent karaoke apparatuses are shifting from hardware sound sources using sound sources (eg, guitars) existing as objects to software sound sources. At this time, the configuration of the soft sound source can be roughly divided into an engine part and a waveform data part.

  The waveform data portion is actually a timbre to be mounted by processing data recorded by playing a musical instrument for each pitch or velocity (sound intensity), although it is actually in a certain section (layer).

  When a high-quality software sound source is installed, the waveform data is configured as 1000 or more timbres. For this reason, the capacity required to store waveform data for all timbres is also several tens of GB.

  Here, in addition to the capacity problem described above, considering the randomizer function that outputs different waveforms even if the same note is specified successively, for example, key control arbitrarily set by the user in the karaoke device, it is used in advance. It is very difficult to specify the waveform data to be performed.

  Therefore, if the memory capacity is not sufficiently installed, there is a problem that it is actually difficult to operate on-memory. Also, the waveform data to be used may be read and used each time, and the sound may be interrupted due to an unexpected time being waited for completion of reading due to serial ATA (SATA) performance, environmental temperature, or the like. Also occurred.

  It is an object of the present invention to be able to handle a large amount of waveform data with limited memory resources, and even when waveform data cannot be read in time, there is little uncomfortable feeling caused by interruptions in pronunciation. The object is to provide a sound source control device, a karaoke device, and a sound source control program capable of providing a performance.

In order to achieve the above object, a sound source control device according to a first aspect of the present invention provides a receiving unit that receives a MIDI command and stores the MIDI command in a ring buffer, and a music piece based on the MIDI command and waveform data of the sound source. A first synthesizer for synthesizing musical sound signals for performance, a second synthesizer for receiving the MIDI command from the receiving unit and instructing reading of the waveform data for music performance, and storing the waveform data a cache area for, said the readings out instructions that by the second synthesizer reads the waveform data stored in the storage means, and sequentially stores the waveform data read out to said cache area waveform readout thread, The first synthesizer includes a predetermined number of delay units defined by the ring buffer. Together sequentially reads the MIDI command pull minutes ago, the replied to PCM data generating unit from the cache area to generate PCM data for playing music reads the waveform data, the PCM data generating unit, the predetermined number the sending instructed to generate a delayed samples before PCM data to the first synthesizer, and wherein the reply to the external sequencer of the PCM data by the first synthesizer to control in time the progress of the music performance To do.

  The sound source control device of the first invention has two of a first synthesizer and a second synthesizer inside. The first synthesizer synthesizes a musical sound signal for musical performance based on a MIDI command received from the ring buffer as a function of a normal synthesizer, using waveform data of a sound source corresponding to the MIDI command. The second synthesizer receives a MIDI command prior to the first synthesizer, and does not perform digital signal processing (DSP processing) by a digital signal processor (DSP) for a normal synthesizer function. An instruction to store the waveform data for music performance to be read by the first synthesizer in the cache area is output to the waveform reading thread.

  In addition, the sound source control device includes a waveform read thread for reading the waveform data stored in the storage unit such as the HDD in response to a read instruction from the second synthesizer and sequentially storing the read waveform data in the cache area.

Here, the first synthesizer, with sequentially reads the predetermined number of the delay samples previous MIDI commands defined by a ring buffer, and generates PCM data for playing music reads waveform data from the cache area PCM Reply to the data generator.

  In other words, the waveform data stored in the storage means such as the HDD can be stored in the cache area when a read instruction is issued to the waveform read thread using the second synthesizer before the first synthesizer. For example, waveform data can be quickly read from the cache area by the first synthesizer.

  The external sequencer is a music sequencer and is an apparatus for performing an automatic performance by reproducing a MIDI command. For example, the external sequencer is provided in a sound source reproducing apparatus such as a karaoke apparatus.

  This external sequencer is outside the sound source control circuit of the present invention and does not constitute the sound source control circuit of the present invention. That is, the external sequencer and the sound source control circuit communicate with each other inside the sound source reproduction apparatus.

  Therefore, if the external sequencer transmits a PCM data generation instruction to the second synthesizer until the first synthesizer actually uses the waveform data, the PCM data return by the first synthesizer is in time for the progress of the music performance. Can be controlled.

  Thus, according to the sound source control device of the first invention, the second synthesizer pre-reads the MIDI command received before the first synthesizer and stores the waveform data in the cache area, and the first synthesizer The waveform data stored by prefetching is read out from the cache area, and a musical tone signal for music performance is synthesized based on the MIDI command and the waveform data of the sound source.

  This makes it possible to handle large volumes of waveform data with limited memory resources, and provides a performance with less discomfort caused by interruptions in pronunciation even when waveform data cannot be read in time. It becomes possible to do.

  A karaoke apparatus according to a second aspect of the present invention is the karaoke apparatus according to the present invention, wherein the music performance PCM data generated by using the PCM data generated by the first synthesizer based on the control of the sound generator control apparatus and the PCM data generation unit is stored. It is characterized by comprising music playback means for playing back music and changing the color of the lyrics telop as the performance progresses.

  As a result, even if the memory capacity is increased by providing a randomizer function for enriching the expression at the same time, or by providing waveform data corresponding to the tone for key control, for example, with limited memory resources In addition to being able to handle large volumes of waveform data, it is possible to provide a karaoke device that can perform with less discomfort due to interruptions in pronunciation even when waveform data cannot be read in time. Become.

Further, according to the sound source control program of the third invention, the first synthesizer for synthesizing the musical sound signal for music performance based on the MIDI command and the waveform data of the sound source, and the waveform data of the waveform data earlier than the music performance progress. A reception procedure for receiving the MIDI command and storing the MIDI command in a ring buffer for a sound source control device having a second synthesizer for reading and controlling the sound source; and After receiving the MIDI command, a control procedure for transmitting a drive instruction to the second synthesizer, and a second synthesizer corresponding to the drive instruction and receiving the MIDI instruction by the second synthesizer in response to the drive instruction. a read instruction procedure instructing the waveform data read, based on the read instruction procedure, the waveform data from the storage means It reads data, the storage procedure of sequentially stored into the cache region, by the first synthesizer, a reading procedure for sequentially reading out the MIDI commands of the delay samples prior to said predetermined number defined by the ring buffer, the first One synthesizer can execute a data generation procedure for reading the waveform data stored in the cache area in the storage procedure and generating PCM data for music performance. The number of delay samples defined by the ring buffer at the time of initializing the karaoke apparatus, by setting the predetermined number may be determined.

  According to the present invention, it is possible to handle a large amount of waveform data with limited memory resources, and even when waveform data cannot be read in time, there is little discomfort due to interruptions in sound generation, etc. A performance can be provided.

It is explanatory drawing which shows the main structures of the karaoke apparatus using the sound source control apparatus which concerns on this invention. The control apparatus which concerns on the karaoke apparatus using the sound source control apparatus which concerns on this invention is shown, (A) is explanatory drawing of the front panel of a control apparatus, (B) is explanatory drawing of the back panel of a control apparatus. It is a functional block diagram which shows the main structures of the control system of the control apparatus which concerns on the karaoke apparatus using the sound source control apparatus which concerns on this invention. It is explanatory drawing of the data format of the music data which concerns on this invention, (A) is explanatory drawing which shows the main structures of the music data transmitted to a control apparatus from a server, (B) is the main of music data which added music count data. An explanatory view showing the structure, (C) is an explanatory view showing the structure of the performance portion of the MIDI data included in the music data. It is a functional block diagram concerning the sound source control device of the present invention. It is explanatory drawing which showed the processing routine in the sound source control apparatus of this invention in time series for every MIDI data. It is a flowchart of the processing routine of the external sequencer in the sound source control device of the present invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a case where the present invention is applied to a karaoke apparatus as an example of a sound source control apparatus will be described as an example.

<Main configuration>
As shown in FIG. 1, the karaoke apparatus 10 has a monitor television (hereinafter simply referred to as “monitor”) that displays a lyrics telop indicating lyrics, a background video displayed on the background of the lyrics telop, a video indicating a song selection number, and the like on a display screen. 11), singer's monitor 12, karaoke music composed of one or more instrument sounds (hereinafter also abbreviated as “song” as appropriate), reservation of music playback, etc. Music selection control, transmission of a request signal indicating a request for transmission of the selected song to the server, communication control such as reception of song data (karaoke song data) corresponding to the song indicated by the request signal, received song data And a control device (commander) 20 for receiving MIDI data as musical tone type designation information.

  Furthermore, in this example, the karaoke apparatus 10 mixes the audio signals input from the microphones 13 and 14 and the reproduction signal of the song, the volume balance between the audio and the song, the echo adjustment, the delay adjustment, the amplification and the reproduction of the mixing signal. An amplifier 15 that performs pitch control (key control) of the tune to be played, control of high and low sounds (tone control), and a set of floor-type speakers 16 that reproduce the amplified signal output from the amplifier 15 as sound; And a set of speakers 17 for hanging the ceiling, and a remote controller 60 for remotely operating the control device 20.

<Outline of control device>
The equipment of the control device 20 will be described with reference to FIG. As shown in FIG. 2A, the front panel of the control device 20 has a numeric keypad 21 consisting of buttons 0 to 9 for inputting the music selection number of the music to be selected and a music selection for confirming the music selection. A button 22 is provided, and a music selection number display 23 is provided on the numeric keypad 21 to display the music selection number of the selected music in LED with a 6-digit number.

  Also, on the left side of the song selection number display 23, there is provided a reserved song number display 24 for displaying the number of songs reserved for reproduction by LED, and below that is for canceling the reservation. A cancel button 25, a performance stop button 26 for stopping performance, a re-singing button 27 for re-singing from the beginning while singing, and an interrupt button 28 for interrupting and reserving between reserved music are provided. ing. Further, a light receiving unit 38 that receives an optical signal transmitted from the remote controller 60 is provided at the upper left of the front panel, and a power button 39 for starting up the power supply of the control device 20 is provided at the lower left.

  Further, to the right of the numeric keypad 21, a flat key 29 for controlling the key of the song to be played low, a standard key 30 for controlling the key of the song to be played as standard, and a key of the song to be played high are controlled. There are provided a sharp key 31 and a vocal button 32 for setting the volume of the vocal melody line, a 2 chorus cut button 33 for reproducing the second chorus, and a song A follower cut button 34 for cutting the follower part is provided. Furthermore, below these buttons, a karaoke switching button 35 for switching between karaoke and BGM, and an input for switching the data input via the LAN line 18 (see FIG. 1) from song data to cable broadcasting, TV broadcasting, etc. A switch button 36 and a service button 37 for switching the display of the monitors 11 and 12 to display of service information provided by a karaoke box or the like are provided.

  Further, as shown in FIG. 2B, a communication terminal 40 for connecting the LAN line 18 is provided on the rear panel of the control device 20. To the right of the communication terminal 40, an audio output terminal 41 connected to an audio input terminal (not shown) of the amplifier 15, a video output terminal 42 connected to a video input terminal (not shown) of the monitor 11, A video output terminal 43 connected to a video input terminal (not shown) of the monitor 12 is provided.

<Control system>
Next, the configuration of the control system of the control device 20 will be described with reference to FIG. In FIG. 3, the control device 20 includes a CPU 44 that executes various controls according to programs. The CPU 44 includes an HDD 45 as a large-capacity storage medium storing waveform data corresponding to MIDI data to be described later, data transmitted from the remote controller 60, music selection number data indicating the music selection number of the selected music, reserved music A RAM 46 for temporarily storing the music selection number data and the like and a ROM 47 in which a program executed by the CPU 44 is stored are connected.

  Further, the CPU 44 has a video RAM (V-RAM) 48 in which character video data for displaying lyrics telop and various message videos on the display screens of the monitors 11 and 12, and music data transmitted from the server 58. LAN board 50 as a receiving unit for receiving 100 (see FIG. 4 described later), a ring buffer area for temporarily storing MIDI commands from music data 100 received by LAN board 50, and a cache of waveform data A RAM 49 functioning as an area is connected. The RAM 49 may be provided separately for the ring buffer area and the waveform data cache area.

  Further, the CPU 44 inputs MIDI data 110 (see FIG. 4 described later) included in the music data 100 read from the RAM 49 and outputs a sound source signal from a sound source specified by the input MIDI data 110. The MIDI sound source board 51 to be connected is connected. Further, the CPU 44 is specified by the sound control circuit 52 that inputs the output sound source signal and converts it into a signal that can be amplified by the amplifier 15, and the genre data 150 (see FIG. 4 described later) included in the music data 100. A CD-ROM player 53 that reads background video data indicating a background video of a genre to be played is connected.

  Further, the background video data read from the CD-ROM player 53 and the lyrics telop data 140 (see FIG. 4 described later) included in the music data 100 read from the RAM 49 are input to the CPU 44, and the monitor 11. A video control circuit 54 is connected to perform video control for creating a video in which the lyrics telop is superimposed on the background video displayed on the display screen or changing the color of the lyrics telop as the music progresses. Yes.

  Further, the CPU 44 includes a conversion circuit 55 that converts the optical signal received by the light receiving unit 38 into a digital signal, and various buttons and keys (such as the numeric keypad 21 and the music selection button 22 described above) provided on the front panel of the control device 20. ) LED that lights up when the key is pressed (the aforementioned music selection number display 23, reserved music number display 24, etc.), a display circuit 56 that outputs a display signal to the LED, and various buttons and keys are pressed. Is connected to an input circuit 57 for inputting a switching signal generated in the circuit.

<Song data>
The main structure of song data will be described with reference to FIGS. 4 (A) and 4 (B). The music data 100 is composed of MIDI data 110 indicating the performance part of the music, lyrics telop data 140 indicating the lyrics telop (caption), genre data 150 indicating the genre of the music, and the like. As shown in FIG. 4B, music count data 120 for counting the start of music can be added to the beginning of the MIDI data 110. As the music count data 120, for example, MIDI data # 1 (refer to FIG. 4C described later) for specifying a MIDI sound source for producing a drum sound is used.

  The configuration of the MIDI data 110 will be described with reference to FIG. As shown in FIG. 4C, in this example, the MIDI data 110 includes, as shown in FIG. 4C, MIDI data # 1 that specifies the sound source of the electronic drum, and MIDI data # 1 that specifies the sound source of the keyboard. 2. MIDI data # 3 designating the sound source of the electric guitar, MIDI data # 4 designating the sound source of the electric guitar, note-on data 112 designating output of the sound source signal from the sound source, sound intensity (sound source signal) Is composed of level data 114 for designating the output level (velocity) and note-off data 116 for designating that the sound source signal is not output from the sound source. The pitch key (original song key) is also determined when the song data is produced.

  The CPU 44 outputs a control signal to the MIDI sound source board 51 and causes the MIDI sound source board 51 to output a sound source signal corresponding to the MIDI data. The sound source signal output from the MIDI sound source board 51 is output to the sound control circuit 52 and converted into a music signal that can be amplified by the amplifier 15, and the converted music signal is transmitted from the sound output terminal 41 to the amplifier 15. Is output.

  The audio signals input from the microphones 13 and 14 are mixed with the music signal in the mixing circuit 19 built in the amplifier 15.

  A mixed signal of the mixed audio signal and music signal is amplified by an amplifier circuit (not shown) built in the amplifier 15, then output to the speaker 16 and the speaker 17, and sounded from the speaker 16 and the speaker 17. .

<Features of this embodiment>
In the basic configuration described above, the present embodiment is characterized by limited memory resources when playing music (sound output) from the speakers 16 and 17 based on a MIDI command, especially when a song is played on the karaoke apparatus 10. An object of the present invention is to provide a performance with which it is possible to handle a large volume of waveform data, and even when waveform data cannot be read in time, there is little uncomfortable feeling caused by interruptions in pronunciation. Hereinafter, the details will be described in order.

  In FIG. 5, the sound source control circuit 70 mounted on the karaoke apparatus 10 includes a first synthesizer 71 and a second synthesizer 72 inside. Based on the MIDI command received from the ring buffer 49A as a normal synthesizer function, the first synthesizer 71 synthesizes a musical tone signal for music performance based on the waveform data of the sound source corresponding to the MIDI command. The second synthesizer 72 receives the MIDI command prior to the first synthesizer 71, does not execute DSP processing for the normal synthesizer function, and stores waveform data for music performance to be read by the first synthesizer 71. The data is stored in the cache area 49B.

  In the ring buffer 49A and the cache area 49B, a partial area of the RAM 49 is used as a ring buffer area and a waveform data cache area.

  The sound source control circuit 70 also includes a waveform read thread 73 that reads the waveform data stored in the HDD 45 in response to a read instruction from the second synthesizer 72 and sequentially stores the read waveform data in the cache area 49B.

  Here, the first synthesizer 71 sequentially reads the MIDI commands for a predetermined number of delay samples determined by the ring buffer 49A, and also reads the waveform data from the cache area 49B to generate PCM data for music performance. It returns to the PCM data generation unit 74.

  That is, the waveform data stored in the HDD 45 can be stored in the cache area 49B when a read instruction is issued to the waveform read thread 73 using the second synthesizer 72 prior to the first synthesizer 71. For example, the first synthesizer 71 can quickly read waveform data from the cache area 49B.

  Therefore, if the external sequencer transmits a PCM data generation instruction to the PCM data generation unit 74 to the second synthesizer 72 before the first synthesizer actually uses the waveform data, the external synthesizer 71 returns the PCM data response from the external sequencer. Control can be performed in time for the progress of music performance controlled by the sequencer.

  If the waveform data to be used by the first synthesizer is not stored in the cache area, the corresponding note is not sounded. In addition, if the sound is already being generated, the sound that is different from the performance is not continued by performing the process of muting (note-off).

  At this time, the CPU 44 gives an instruction to change the color of the lyrics telop to the monitors 11 and 12 for displaying the lyrics video in synchronism with the progress of the performance of the PCM data for music performance.

  Hereinafter, based on FIG. 5, a reproduction processing routine when the CPU 44 processes the MIDI data transmitted from the external sequencer 59 will be described. In addition, in FIG. 5, while showing the procedure from the process 1 to the process 16 shown below with a number with a circle, the rough process name is attached | subjected.

  The external sequencer 59 is a music sequencer and is an apparatus for performing an automatic performance by reproducing a MIDI command. For example, the external sequencer 59 is provided in the karaoke apparatus 10.

  The external sequencer 59 is outside the sound source control circuit 70 of the present embodiment, and communicates with the sound source control circuit 70 by a circuit inside the karaoke apparatus 10.

  Therefore, if the external sequencer 59 sends a PCM data generation instruction to the second synthesizer 72 before the first synthesizer 71 actually uses the waveform data, the PCM data reply from the first synthesizer 71 is played back. It can be controlled to keep up with the progress.

  Process 1: The external sequencer 59 controlled by the CPU 44 transmits MIDI music data to the sound source control circuit 70 as the music progresses.

  Process 2: When the sound source control circuit 70 receives the MIDI command, the CPU 44 transmits the MIDI command from the MIDI command receiving unit 50 to the ring buffer 49A and stores it, and also transmits it to the second synthesizer 72.

  Process 3: When the second synthesizer 72 receives the MIDI command, the CPU 44 causes the MIDI command receiving unit 50 to transmit a response signal related to reception from the second synthesizer 72.

Process 4: The CPU 44 returns a response from the MIDI command receiving unit 50 to the external sequencer 59 when the MIDI command receiving unit 50 receives the response. This response is made to one piece of MIDI data.
Process 5: When the PCM generation instruction is output from the external sequencer 59, the CPU 44 transmits the PCM generation instruction to the PCM data generation unit 74.

  Process 6: When the PCM data generation unit 74 receives the PCM generation instruction, the CPU 44 causes the first synthesizer 71 and the second synthesizer 72 to output a drive instruction signal from the PCM data generation unit 74.

  Process 7: When the second synthesizer 72 receives the drive instruction signal from the PCM data generation unit 74, the CPU 44 causes the waveform read thread 73 to output a waveform data read instruction signal from the second synthesizer 72.

  Process 8: When the waveform readout thread 73 receives the waveform data readout instruction signal, the CPU 44 causes the HDD 45 to output a waveform readout signal.

  Process 9: When the HDD 45 receives the waveform data read instruction signal, the CPU 44 stores, for example, waveform data (eg, waveform data A, waveform data) of the MIDI command corresponding to each of the MIDI data # 1 to # 4 in the cache area 49B. B: Stores waveform data n). Here, in the cache area 49B, for example, the capacity (for example, 100 MB) allocated as the cache area 49B in the RAM 49 can be designated / changed from the outside, but the CPU 44 is old when the capacity is full. Erase sequentially from sequential data waveforms. The waveform data once read can be reused as long as it is not erased.

  Process 10: The CPU 44 causes the first synthesizer 71 to output a MIDI command extraction request to the ring buffer 49A.

  Process 11: When the ring buffer 49A receives the take-out request, the CPU 44 takes out a predetermined number of MIDI commands (for example, MIDI data # 1 to # 4 corresponding to one music note) and outputs it to the first synthesizer 71. .

  Process 12: When receiving the MIDI command, the CPU 44 causes the first synthesizer 71 to output a waveform data read request to the cache area 49B.

  Process 13: When the cache area 49B receives the waveform data read request, the CPU 344 causes the first synthesizer 71 to output waveform data corresponding to the MIDI command from the cache area 49B.

  Process 14: When the first synthesizer 71 receives the waveform data from the cache area 49B, the CPU 44 causes the DSP process to be performed.

  Process 15: When the first synthesizer 71 performs the DSP process, the CPU 44 outputs the PCM data to the PCM data generation unit 74.

  Process 16: When the PCM data generator 74 receives the PCM data, the CPU 44 generates PCM data and outputs it to the external sequencer 59.

  That is, as shown in FIG. 6, the response (for example, PCM A) from the PCM data generation unit 74, which is music data, is related to the MIDI transmission (for example, MIDI transmission A) from the external sequencer 59.

  Then, the PCM A corresponding to MIDI A reflects the MIDI data A of MIDI transmission before a predetermined number of delay samples.

Accordingly, the first PCM data contents of MIDI event has been reflected can be acquired, a predetermined number of delay samples min after the PCM data.

Incidentally, considering the read time of the HDD 45, the external sequencer 59 acquires PCM data is delayed a predetermined number of delay samples worth of real-time (delay time). In FIG. 6, the first three answers to the PCM data are processed as invalid data here. An example of a specific process, PCM data generating unit is the predetermined number of delay samples partial outputs silence data. Or for PCM data generating unit audio control circuit 52, by giving an instruction not to output the PCM data of a predetermined number of delay samples in the period, invalid data may not be output to the outside. As a result, noise due to invalid data is not output immediately after the performance of the music starts.

  Next, the processing routine of the external sequencer 59 will be described with reference to FIG.

(Step S1)
In step S <b> 1, the external sequencer 59 outputs an initialization signal to the sound source control circuit 70 and determines whether or not a performance request for music performance has been received from the CPU 44. When the external sequencer 59 receives a performance request for music performance from the CPU 44 (Yes), the external sequencer 59 proceeds to step S2. If the external sequencer 59 does not determine that a performance request for music performance has been received from the CPU 44 (No), the external sequencer 59 continues to monitor this routine.

(Step S2)
In step S2, the external sequencer 59 receives the MIDI data to be played from the HDD 45, sequentially transmits MIDI commands to the tone generator control circuit 70 (corresponding to process 1), and proceeds to step S3. .

(Step S3)
In step S3, the external sequencer 59 transmits a PCM data generation instruction to the sound source control circuit 70 (corresponding to the process 5), and proceeds to step S4.

(Step S4)
In step S4, the external sequencer 59 receives PCM data from the sound source control circuit 70 (corresponding to process 16), and proceeds to step S5.

(Step S5)
In step S5, the external sequencer 59 reproduces the PCM data, and proceeds to step S6.

(Step S6)
In step S6, the external sequencer 59 determines whether or not the performance of the music, that is, the reproduction of the PCM data for the MIDI data for one music received from the HDD 45 in step S1 is completed. The external sequencer 59 proceeds to step S7 when the reproduction of the PCM data for one piece of MIDI data has been completed (Yes). If the external sequencer 59 does not determine that the reproduction of the PCM data for one piece of MIDI data has been completed (No), the external sequencer 59 loops to step S2, and thereafter the PCM data for one piece of MIDI data is copied. The routine from step S2 to step S6 is repeated until the reproduction is completed.

(Step S7)
In step S7, the external sequencer 59 outputs an end signal to the sound source control circuit 70 and ends this routine.

  As described above, the tone generator control circuit 70 prefetches the MIDI command received by the second synthesizer 72 before the first synthesizer 71 and stores the waveform data in the cache area 49B. The first synthesizer 71 prefetches the MIDI data. Is read from the cache area 49B, and a musical tone signal (PCM data) for music performance is synthesized based on the MIDI command read from the ring buffer 49A.

  This makes it possible to handle large volumes of waveform data with limited memory resources, and provides a performance with less discomfort caused by interruptions in pronunciation even when waveform data cannot be read in time. It becomes possible to do.

  Further, in the karaoke apparatus 10 provided with such a sound source control circuit 70, the reproduction of the music and the lyrics are performed as the performance of the PCM data for music performance generated using the PCM data generated by the first synthesizer 71 progresses. You can change the color of the telop.

  As a result, in addition to waveform data corresponding to normal (as per note) timbre, it is provided with a randomizer function for enriching the expression when the same tone is repeated, for example, waveform data corresponding to a tone for key control. Even if the memory capacity increases, it becomes possible to handle a large amount of waveform data with limited memory resources, and even when waveform data cannot be read in time, It is possible to provide a performance with less discomfort.

  If the waveform data scheduled to be used by the first synthesizer 71 is not stored in the cache area 49B, the corresponding note is not sounded. In addition, if the sound is already being generated, the sound that is different from the performance is not continued by performing the process of muting (note-off).

Here, as described above, in the ROM 47, the first synthesizer 71 for synthesizing the musical sound signal for music performance based on the MIDI command and the waveform data of the sound source, and the waveform data are read out earlier than the music performance progress. And a second synthesizer 72 for receiving the sound, and the sound source control circuit 70 for controlling the sound source receives the MIDI command and stores the MIDI command in the ring buffer 49A (processing 2), After receiving the MIDI command in the reception procedure, a control procedure (process 6) for transmitting a drive instruction to the second synthesizer 72, and a second synthesizer corresponding to the drive instruction and corresponding to the MIDI command received in the reception procedure by 72, a read instruction procedure for instructing reading of the waveform data for music performance (process 7), on the basis of the read instruction procedure, HD 45 reads waveform data from the storage procedure of sequentially stored into the cache area 49B (processing 9), the first synthesizer 71, sequentially reads read a predetermined number of delay samples before MIDI commands defined by the ring buffer 49A A procedure (Process 11) and a data generation procedure (Processes 12 to 15) for reading waveform data stored in the cache area 49B by the storage procedure and generating PCM data for music performance by the first synthesizer 71. A sound source control program to be executed by the CPU 44 is stored.

  As described above, the karaoke apparatus 10 includes the sound source control circuit 70, and the sound source control circuit 70 includes a normal first synthesizer 71 and a second prefetch synthesizer 72 that does not perform DSP processing. .

  A ring buffer 49A for storing the MIDI command and a cache area 49B for storing waveform data A to n corresponding to the MIDI command prior to the DSP processing by the first synthesizer 71 are provided, and the latency (delayed) by the first synthesizer 71 is provided. Prior to (time), a time for prefetching waveform data is set in advance.

  If waveform data cannot be read in time for the set time, it is discarded. That is, when the waveform data being sounded cannot be read in time, sound generation may be stopped and thereafter, it may not be restored from the middle.

  The MIDI command stored in the ring buffer 49A is extracted from the ring buffer 49A after the latency (the number of processed samples) by the first synthesizer 71, and the DSP processing is executed with the waveform data read from the cache area 49B. .

The number of delay samples defined by the ring buffer 49A has been described as 3 in the present embodiment. However, the user may not be able to specify the reading performance of the HDD 45 in advance. For this reason, after the installation of the HDD 45, the waveform data cannot be read in time for the reading time of the HDD 45, and sound interruptions or the like are detected from the speaker 16 as an output signal from the sound source control circuit 70. For this reason, input means (for example, an input circuit 57) for changing the number of delay samples (in the direction of increasing from the initial numerical value) is provided, and when the sounding interruption is detected, the CPU 44 is initialized when the karaoke apparatus 10 is initialized. May be determined by setting the predetermined number to a value larger than the number of delay samples when sounding interruption is detected.

10 Karaoke device 44 CPU (music playback means)
45 HDD (storage means)
49A Ring buffer 49B Cache area 50 LAN board (receiver)
70 sound source control circuit 71 first synthesizer 72 second synthesizer 73 waveform reading thread 74 PCM data generation unit

Claims (6)

A receiving unit for receiving a MIDI command and storing the MIDI command in a ring buffer;
A first synthesizer for synthesizing a musical sound signal for music performance based on the MIDI command and sound source waveform data;
A second synthesizer for receiving the MIDI command from the receiving unit and instructing reading of the waveform data for music performance;
A cache area for storing the waveform data;
Reading said waveform data stored in the storage means according to an instruction out read that by the second synthesizer, a waveform readout threads for sequentially storing and the waveform data read out to the cache area,
With
The first synthesizer is
The MIDI commands before a predetermined number of delay samples determined by the ring buffer are sequentially read out, and the waveform data is read out from the cache area to generate PCM data for music performance and return it to the PCM data generator. ,
The PCM data generation unit
Said instructing to generate the delayed samples before PCM data of a predetermined number is transmitted to the first synthesizer controls in time a response to external sequencer of the PCM data by the first synthesizer to the progress of the music performance A sound source control device characterized by the above. A sound source control device according to claim 1;
In the progress of the performance of the PCM data for music performance generated using the PCM data generated by the first synthesizer based on the control of the PCM data generation unit of the sound source control device, the reproduction of the music and the lyrics telop Music playback means for changing the color of
A karaoke apparatus comprising: The karaoke apparatus according to claim 2,
The karaoke apparatus , wherein the PCM data before the predetermined number of the delayed samples is silence data. The karaoke apparatus according to claim 2,
The PCM data generation unit
A karaoke apparatus characterized by giving an instruction not to perform reproduction to the music reproduction means during a period in which the predetermined number of PCM data before the delay sample is output. The karaoke apparatus according to any one of claims 2 to 4,
The karaoke apparatus is provided with an input means further sets the number of predetermined number of delay samples,
2. A karaoke apparatus according to claim 1, wherein when the music reproduction means detects a break in sound, the number of delay samples is set to a number larger than the number of delay samples at the time when the break in sound is detected . A first synthesizer for synthesizing a musical tone signal for music performance based on a MIDI command and sound source waveform data; and a second synthesizer for reading out the waveform data earlier than the music performance progresses. For the sound source control device that controls the sound source,
A receiving procedure for receiving a MIDI command and storing the MIDI command in a ring buffer;
A control procedure for transmitting a drive instruction to the second synthesizer after receiving the MIDI command in the reception procedure;
In response to the drive instruction, in response to the MIDI command received in the reception procedure, a read instruction procedure for instructing the second synthesizer to read the waveform data for music performance;
A storage procedure for reading the waveform data from the storage means based on the read instruction procedure and sequentially storing it in the cache area;
A reading procedure for sequentially reading out the MIDI commands of a predetermined number of delay samples determined by the ring buffer by the first synthesizer;
A data generation procedure for reading out the waveform data stored in the cache area in the storage procedure by the first synthesizer and generating PCM data for music performance;
Sound source control program to execute

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